Unicode: 228E. Infix operator. x ⊎ y is by default interpreted as UnionPlus[x,y]. Used to denote union of multisets, in which multiplicities of elements are added.
Unicode: 2196. Infix arrow operator. x ↖ y is by default interpreted as UpperLeftArrow[x,y]. Extensible character; grows by default to limited size.
Unicode: 2197. Infix arrow operator. x ↗ y is by default interpreted as UpperRightArrow[x,y]. Extensible character; grows by default to limited size.
Unicode: 22EE. Letter-like form. Used to indicate omitted elements in columns of a matrix.
Unicode: 2240. Infix operator. x ≀ y is by default interpreted as VerticalTilde[x,y]. Used in mathematics to mean wreath product.
Unicode: F725. Letter-like form. Used in yellow to indicate messages and other warnings in the default style for Mathematica notebooks. Based on an international standard ...
Unicode: 231A. Letter-like form. Used to indicate a calculation that may take a long time.
"MoveNext" is a front end token that moves the insertion point right by one character.
"MoveNextWord" is a front end token that moves the insertion point right by one word.
"MovePreviousLine" is a front end token that moves the insertion point up by one line.