a check or draft, usually one of a set, issued by a bank, etc. in any of several denominations and sold to a traveler who signs it at issuance and again in the presence of the person cashing it
See traveler's check in American Heritage Dictionary 4
nounpl.traveler's checks or travelers' checks
An internationally redeemable draft purchased in various denominations from a bank or traveler's aid company and payable only upon the purchaser's endorsement against the original signature on the draft.