Difference between revisions of "Main Page"

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;™ : Trademark Sign. U+2122
 
;™ : Trademark Sign. U+2122
 
;÷ : divide. U+00F7
 
;÷ : divide. U+00F7
;�± : plus-minus. U+00B1
+
;± : plus-minus. U+00B1
 
;≠ : not equal. U+2260
 
;≠ : not equal. U+2260
 
;≈ : approximately equal. U+2248
 
;≈ : approximately equal. U+2248

Revision as of 00:41, 10 December 2014


Noah's Notes

Engineering

Science

Physics

All the physics equations on one handy page: physics equations.

Some Useful Unicode Symbols

In Linux you can enter Unicode hex values directly by holding ctrl and shift while typing u followed by the 4 digit hex value of Unicode character. You hold ctrl and shift for the entire sequence. So <ctrl-shift>U221E will produce the infinity sign, .

See also:

Common characters that people often get wrong.

Some symbols look the same as their counterparts in the Greek alphabet, but these are actually seen as different in Unicode. These do not decompose as equivalent or compatible. For example, if you mean Ohm you should use the Ohm sign, not the Greek Omega. Probably this makes little practical difference in the real world. Any sort of semantic search indexing system probably has special cases for Greek letters used in other contexts. This can affect sorting and lexical indexing, but again, I can't think of any instance where this would actually cause a problem. Some fonts might be complete for some code points in the code space, but not others. I've not seen any that have the Greek letters, but not the Mathematical signs. So really, you want to use the correct symbol just to be correct, smartypants.

Ω 
Ohm sign, not Greek Omega, Ω. U+2126
µ 
Micro sign, not Greek Mu, μ. U+00B5

Characters that are commonly used, but are not common on most US keyboards.

∑ 
Mathematical sigma. U+2211
Ω 
Ohm sign. U+2126
µ 
Micro sign. U+00B5
Å 
Ångström Sign. U+212B
√ 
Square Root. U+221A
∫ 
Integral. U+222B
∞ 
Infinity. U+221E
° 
Degree. U+00B0
℉ 
Degree Fahrenheit. U+2109
℃ 
Degree Celsius. U+2103
Kelvin sign. U+212A
ℎ 
Plank constant. U+210E
€ 
Euro currency symbol. U+20AC
£ 
Pound Sterling. U+00A3
© 
Copyright symbol. U+00A9
™ 
Trademark Sign. U+2122
÷ 
divide. U+00F7
± 
plus-minus. U+00B1
≠ 
not equal. U+2260
≈ 
approximately equal. U+2248
⁰ 
superscript zero. U+2070
¹ 
superscript one. U+00B9
² 
superscript two. U+00B2
³ 
superscript three. U+00B3
⁴ 
superscript four. U+2074
⁵ 
superscript five. U+2075
⁶ 
superscript six. U+2076
⁷ 
superscript seven. U+2077
⁸ 
superscript eight. U+2078
⁹ 
superscript nine. U+2079
½ 
1/2. U+00BD
¼ 
1/4. U+00BC
¾ 
3/4. U+00BE
⅓ 
1/3. U+2153
⅔ 
2/3. U+2154
⅕⅖⅗⅘
fifths. U+2155 - U+2158
⅙⅚
sixths. U+2159 U+215A
radioactive sign. U+2622
♳ 
plastic code polyethylene terephthalate (PET or PETE). U+2673
♴ 
plastic code high density polyethylene (HDPE). U+2674

= Some Useless Unicode Symbols

 
Greek Question Mark. U+037E. Although this may be canonically decomposed to a real semicolon (U+003B), this is not required and I am not aware of any IDE text editors that automatically normalize Unicode. The Greek Question mark can really screw up C, C++, Java, and anything else that relies on semicolons for syntax. This should not be taken as an invitation to a practical joke.

Technical

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{{#random:Beasts of birden: a parrot is a beast of birden.


Touch the puppet head.


A gigantic nuclear furnace.


When in doubt, tell the truth.


I am entropy.


Less input. More output.


...bytes to bytes and bits to bits:

>/dev/null 2>&1

The truth shall make you free.


The arrows affected the aardvark. The effect was eye-popping.


Disaster's on its way, for sure,
For this libation is liqueur.


a wiki of every tech fact I have ever learned


Sometimes the fault isn't in the same spot as the failure.


There are 10 types of people in the world -- those that understand binary, and those that don't.


This is happening soonishly now...


1111111111 * 1111111111 == 1234567900987654321


“Not what we have, but what we enjoy, constitutes our abundance.” - Epicurus


Newbie says, "What?"

:(){:|:&};:

We are here to serve humanity. here to reaffirm gentility. Life away from fear to sanity. Carefully promote tranquility. Grant us neither gifts not gratitude.... -- The Monitors


"Why" -- a nasty little Protestant word. -- Bless me, Father.


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