From taphach (the same as tephach) -- hand-breadth (broad).
see HEBREW taphach
see HEBREW tephach
H2948. tophach
טֹ֫פַח noun masculineEzekiel 40:43 span, hand-breadth — always absolute טֹפַח Exodus 25:25; 37:12 (both P), width of border of table in tabernacle; Ezekiel 40:5; 43:13 addition to common cubit; 40:43 width of border (ledge) of four tables in new temple (Sm Co).