checklist, verify, valid, mark, process, tick, check, agree, approval, blue, checkmark, concept, correct, right, wooden, accept, agreement, approve, background, block, box, business, choice, choose, confirm, copy, cube, customer, decision, evaluation, finger, good, hand, icon, metaphor, ok, okay, opinion, positive, questionnaire, satisfaction, sign, space, survey, symbol, validate, validation, vote, voting, yes