Related Clues:
- It's 1, for a 90-degree angle
- Wave to a math teacher?
- Mathematics ratio
- Something to toss in the fireplace
- Object for a fireplace
- It may be thrown into the fireplace
- Large piece of a tree
- Something that's cut for firewood
- Something to burn in the fireplace
- ''Captain's ___'' ("tar Trek"opening)
- Fireplace need
- Something to place in a fireplace
- Thing in a fireplace
- Informally, the mathematical function inverse to exponentiation
- ___ qua non (essential element)