(ren) noun
1. Any of numerous small passerine birds (family Troglodytidae) having short rounded wings and a short tail, including the common house wren (Troglodytes aëdon), the Carolina wren (Thryothorus ludovicianus), Bewick's wren (Thryomanes bewicki) of North America, and the European wren (Nannus troglodytes).
2. Any one of numerous similar birds. [OE wrenna]

(ren), Sir Christopher,
1632–1723, English architect.
—Percival Christopher,
1885–1941, English novelist.
TYPES OF WRENCHES
a. Engineer's wrench.
b. Socket wrench.
c. Bicycle wrench.
d. Monkey wrench.
e. Pipe wrench.
f. Ratchet wrench.
g. Offset wrench.
h. S–wrench.