Related Clues:
- Common desk shape
- Addition to a school, say
- 90-degree pipe fitting
- Architectural wing, e.g
- Architectural extension
- Letter that forms a right angle
- Annex, maybe
- Letter-perfect 90-degree bend
- Angled pipe fitting
- Bulky center?
- Half a rectangle
- Architectural wing shape, often
- Letter with a 90-degree bend
- Fast-growing school's need, perhaps
- Incorporate, as new territory