SUB

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sub

[səb]
(petroleum engineering)
A short, threaded section of pipe used to adapt portions of the drilling string that otherwise cannot be screwed together because of variations in thread or design.

SUB

On drawings, abbr. for “substitute.”

SUB

References in periodicals archive ?
After examining feedback from Capistrano's Super Sub session, one thing was clear to Chief Personnel Officer Suzette Lovely: Subs wanted more classroom management training.
Districts may solicit thoughts from subs at the end of each school day, too.
We put strong emphasis on the training and keeping in touch with subs and making them feel like they're part of our school family," Coffey says.
Keeping subs, she adds, helps "maintain the continuity of instruction.
But perhaps the best sign of success is when subs decide to make the leap into teaching full-time--and everyone seems to know someone who's done this.
Welcoming substitutes into the district and providing training are great starting efforts, but the districts that manage to retain those subs are in the best shape longterm.
i]/i [member of] I} will have a countable sub cover which in turn becomes countable open cover for (X, [[tau].
i]/i [member of] I} will have a finite sub cover which in turn becomes finite open cover for (X, [[tau].
Thus U is a countable sub collection of U; V' is a countable sub collection of V, which covers X with respect to [[tau].
i]/i [member of] I}[union] {X - A} are (i, j) and (j, i) semi open covers of X respectively, which implies U' and V' admits countable sub covers which in turn gives countable sub covers for A.
Since both L and L' are uncountable, no countable sub collection covers [R.