Here are some common one-letter abbreviations you’ll find throughout idiomatic Coldtype code.

• e usually refers to “easing”, as in the f.e function (frame.easing)
• f usually refers, when used as a variable, to the Frame object that is passed to an @animation renderable.
• .f refers, when used as a function, to fill, as in the fill color of a path
• .s refers, when used as a function, to stroke, and .sw refers to stroke width
• .fssw refers to fill-stroke-strokewidth as a single concept. This is something I use all the time in my own work, as I almost never set a stroke without also setting the fill (usually to -1 to be transparent).
• r usually refers, when used as a variable, to the Rect object that is passed to a @renderable renderable.
• f.a.r is a common shorthand for frame.animation.rect, i.e. the rectangle frame of an @animation renderable.