Definition of wall bracket:
(n) :
item attached to a wall to hold up a shelf; generically any of "(", ")", "[", "]", "{", "}", and, in the area of computer languages, "<", ">"
"tax bracket, age bracket"
(v) :
to bound on both sides, to surround as enclosing with brackets
"I tried to hit the bullseye by first bracketing it with two shots and then splitting the difference with my third, but I missed."