“tick-outline”

20 symbols from Material Design Icons

ticket-outline

ticket-confirmation-outline

ticket-percent-outline

check-outline

account-check-outline

bug-check-outline

calendar-check-outline

check-circle-outline

check-network-outline

checkbox-multiple-outline

clipboard-check-outline

comment-check-outline

email-check-outline

eye-check-outline

map-check-outline

shield-check-outline

timer-check-outline

account-multiple-check-outline

file-document-check-outline

text-box-check-outline