$Messages gives the list of files and pipes to which message output is sent.
CDefault[] is a symbolic representation of a default statement.
SetCoordinates[coordsys] sets the default coordinate system to be coordsys with default variables. SetCoordinates[coordsys[c_1, c_2, c_3]] sets the default coordinate system ...
BoxRatios is an option for Graphics3D that gives the ratios of side lengths for the bounding box of the three-dimensional picture.
Unicode: 2296. Alias: Esc c- Esc. Infix operator. x ⊖ y is by default interpreted as CircleMinus[x,y].
Unicode: 0F3D3. Aliases: Esc cond Esc. Infix operator with built-in evaluation rules. exprpred is by default interpreted as Conditioned[expr,pred].
Unicode: 2233. Alias: Esc cccint Esc. Compound operator. ∳ f x is by default interpreted as CounterClockwiseContourIntegral[f,x].
Unicode: 0F3D5. Aliases: Esc de Esc. Infix operator with built-in evaluation rules. uv is by default interpreted as DirectedEdge[u,v].
Unicode: 0F3D2. Aliases: Esc dist Esc. Infix operator with built-in evaluation rules. xdist is by default interpreted as Distributed[x,dist].
Unicode: 21D3. Infix arrow operator. x ⇓ y is by default interpreted as DoubleDownArrow[x,y]. Extensible character.