Mathematics
Alt Code	Symbol	Description
Alt 48 - 57	0 - 9	zero to nine
Alt Codes for Basic Operators
Alt Code	Symbol	Description
Alt 43	+	Plus Sign
Alt 45	-	Minus Sign
Alt 0215	×	Multiplication Sign
Alt 0247	÷	Obelus / Division sign
Alt Codes for Percents
Alt Code	Symbol	Description
Alt 37	%	Percentage Sign
Alt 0137	‰	Per mille (per thousand)
Alt Codes for Bracketing
Alt Code	Symbol	Description
Alt 40	(	Open Bracket
Alt 41	)	Close Bracked
Alt Codes for Degree of Accuracy
Alt Code	Symbol	Description
Alt 241	±	Plus or Minus
Alt Codes for Fractions
Alt Code	Symbol	Description
Alt 47	/	Fraction seperator
Alt 0188	¼	Quarter
Alt 0189	½	Half
Alt 0190	¾	Three quarters
Alt 46	.	Decimal Point
Alt Codes for Equality
Alt Code	Symbol	Description
Alt 240	≡	Exactly Identical
Alt 61	=	Equals
Alt 247	≈	Approximately equal
Alt Codes for Inequality
Alt Code	Symbol	Description
Alt 60	<	Less Than
Alt 62	>	Greater Than
Alt 242	≥	Greater than or equal
Alt 243	≤	Less than or equal
Alt Codes for Powers
Alt Code	Symbol	Description
Alt 251	√	Square Root
Alt 252	ⁿ	Power n
Alt 0185	¹	To the power of 1
Alt 0178	²	squared
Alt 0179	³	cubed
Alt Codes for Trigonometry
Alt Code	Symbol	Description
Alt 227	π	Pi
Alt 248	°	Degree sign
Alt Codes for General Mathematical Symbols
Alt Code	Symbol	Description
Alt 35	#	Number
Alt 236	∞	Infinity
Alt 230	µ	Micro
Alt 228	Σ	Sum
Alt 239	∩	Intersection
Alt Codes for Integration / Antiderivatives
Alt Code	Symbol	Description
Alt 244	⌠	Top half
Alt 245	⌡	Bottom Half

About Alt Codes:

International Business Machines (IBM) developed a method to place characters that were previously impossible to type with a traditional QWERTY keyboard on the screen. By holding down the ALT key, developers and end users could define the intended character by way of the numeric keypad. The computer system's Basic Internal Operating System (BIOS) subsequently interprets the action and placing the correct corresponding symbol at the location of the cursor.

Such codes became so incredibly popular that although Microsoft decided upon developing additional sets of codes, they also decided to keep the existing Alt codes. The new set designed to coexist with also codes was originally named ANSI, with the old version redesignated as Original Equipment Manufacturer (OEM). Codes written in OEM are represented in 3 digits while codes written in ANSI codes begin with a preceding 0.

For the past 20 years, Unicode has seen major adoption by a growing number of systems. The entry of all Unicode characters by the same method of Windows was achieved by many applications yet still couldn't spread to every system. Issues of compatibility with old ANSI codes prevented the entry of every single character.

Alt Code Tips:

• Depending on the setting of the OEM Code Page, different characters may be produced with the same code.
• It is critical to have the system's NUM LOCK enabled when typing a character's alt code value.
• Though it is present on some models, the right-most numeric keypad does NOT exist on most laptops. To still make sufficient use of the functionality, most laptop users are required to use press and hold down the Fn key.

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