Looking at this  map in Hong Kong:      I notice they used different interconnection symbols:   ...  What do they mean?
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On the , some of the interchange symbols have little lines and half-circles in them. They're a bit small to read on some maps, but if you zoom in they get a big clearer:    Are these suggestions for where to change depending on the direction you're going + changing to? Or do they have some other meaning?  .  Bonus marks - Assuming I am right that that these are direction interchange suggestions, what does it mean if it's an empty circle, or a "T" in one?
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I'm confused about the use of symbols $\vdash$ and  $ \models$. Reading the answers to  and  I see that:  the turnstile symbol $ \vdash $ denotes syntactic implication. Then $ S \vdash \psi$ means that $\psi$ can be derived from the formulae in $S$  the double turnstile $ \models $, denotes semantic implication. Then the notation $A \models B$ means simply that B is true in every model in which A is true.  So I understand that, e.g., $(ZFC+ A) \vdash B$ means that $A \Rightarrow B$ is a theorem in ZFC and, in this sense $\vdash$ is a mathematical symbol for a theorem. While $(ZFC+ A) \models B$ means that $ B$ is true in every model of ZFC in which $A$ is true, and, in this sense $\models$ is not a mathematical but a metamathematical symbol.  I understand correctly? And those are the only uses of the two symbols?
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What do solid or dashed lines on a wire indicate?  Is there a difference between the solid and dashed indicators?
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I am using Mac OSX. When I type ls -l I see something like   drwxr-xr-x@ 12 xonic  staff    408 22 Jun 19:00 . drwxr-xr-x   9 xonic  staff    306 22 Jun 19:42 .. -rwxrwxrwx@  1 xonic  staff   6148 25 Mai 23:04 .DS_Store -rw-r--r--@  1 xonic  staff  17284 22 Jun 00:20 filmStrip.cpp -rw-r--r--@  1 xonic  staff   3843 21 Jun 21:20 filmStrip.h   What do the @'s mean?
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The signal indicator on my phone often shows "3G" or "H+" in the signal indicator. When there's no connectivity it doesn't show anything.  I'm referring to the icons in the status bar like these:      What are the different signal icons that are shown in android? I've never used an LTE/4G handset or even been on one of those networks so I'm also curious to see what indicators are used for those.
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The LCD below is from a cheap digital clock which was (obviously) damaged (broken glass).    The electrical connection between the PCB and the display was realized with this pink strip.    Its flexible...    ...and consists of alternating rows of conductive and insulating material between the pink boarders.    [above image was altered in contrast/brightness to highlight the alternating strips]  What is this kind of connector called? Is it only used for displays?   I am pretty impressed that the connection is reliable just from the very slight pressure between the strip and the PCB. Also, its easily removable from the display. There seems to be some conductive layer on the glass, from where the signal goes into the displays internals. This connection seems to be damaged for the three rightmost signals, where the glass is broken.
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If you swipe all the way to the left on the menu and then some, this sequence of symbols appears. (Do not pay any mind to the white circles: it's where I was holding my finger. The space between the first few and the last three symbols is also not present in game.)    What gives?
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I've been asked to complete this chart and have never come across this symbol before, nor can I find anything about it on google:    What does the $\bar{y}$ with the line over it represent? And also, does the the t^2 column just mean square all of the time values for each row?
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I've created a map system for a game that runs on the principle of drawing the picture of the map from tiles. There are many reasons for this which I won't go into here but if you really want to know then I'm sure you can find out how to contact me ;)  I have  so you can see exactly where the problem lies and the source. The issue is the line between the top 2 tiles and the bottom 2 tiles, I can't figure out why it's gone like this and any help would be appreciated.  In the source is a marker called "stackoverflow", if you search for "stackoverflow" when viewing source then it should take you to the table in question.  I have also uploaded an .
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First, let me say that I'm no electrical engineer, I'm just a curious student.   Here's a photo of a Raspberry Pi A+.    I (as one completely ignorant of PCB design) would expect the electrical paths to be as simple as possible, which normally implies using the shortest path from the source to destination. Here, the printer can clearly print straight diagonal paths, but some other nearby paths are stair-stepped, or even take bizarre roundabout paths to their destinations.  I've seen this on a variety of PCBs, including other models of the Raspberry Pi, some Arduinos, computer motherboards...  Can you explain, in layman's terms, why these more complex paths are chosen?
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The board I'm looking at is a modem board from a fax machine.  There are 2 identical components labeled VZ1 and VZ2 on the board, both components have F175 on the face and have 2 SMC leads.  One of them has a resistor across the back pins, and they look like they might be part of the power circuitry.
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I was wondering about the reason of the choose of the X as symbol used to represents the "Close application" operation.
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I probably should elaborate. I'm looking for the icons for the keyboards (the flags and the cutout-of-white icons used for Japanese/Chinese/that one used for custom inputs). I did some poking around and couldn't find them. If you find them please post an answer. I really need these for something.
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I saw two less than signs on this Wikipedia article and I was wonder what they meant mathematically.    EDIT: It looks like this can use TeX commands. So I think this is the symbol: $\ll$
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I found this question and its answer on internet-  Q. Can I use "I have been to Hong Kong" instead of "I went to Hong Kong"? A. Not when you are specifically talking about your first trip abroad (in the past).  But I do not understand what it means. Could you please let me know the difference?
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Could someone please tell me what the symbol ringed in red represents?     I know it has ON Switch pointing to it, but the symbol has other lables in different parts of the document.
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In some texts (mainly complex analysis or harmonic analysis) I sometimes see the following double subset symbol $\subset\subset$ for inclusion relation of two regions, e.g., $\Omega$ and $\Omega'$ are two regions in $\mathbb{C}$ such that $\Omega \subset\subset \Omega'$. I never figured out what it means exactly; I always interpreted it as the closure $\overline{\Omega}$ is contained in $\Omega'$ (so that some nasty boundary effects can be avoided). Is that right? Or does $\subset\subset$ mean some other kind of inclusion? Thanks.