Related Clues:
- Shelf-bracket shapes
- 90-degree angle formations
- Some Tetris pieces
- Additions, perhaps
- Right-angled annexes
- 90-degree add-ons
- 90-degree building additions
- Duckbill's tail?
- Lullaby's three?
- Building add-ons
- Quarter turns
- Architect's additions
- Lengths of cloth to dispose of, first to last
- Some architectural wings
- House extensions