Ключевые слова: abstract, again, arrowheads, backward, begin, behind, circle, circular, collection, communication, controller, cursor, designator, dimensions, directional, eps 10, flat, front, graphic, icon, load, loop, marker, navigation, network, next, pointer, recover, redo, refresh, reload, repeat, reset, restart, revise, revision, rewind, rotation, round, shadow, sign, spin, start, switch, symbol, synchronize, turn, undo, vector,