Brèf definitions

Bref

1) Bat reference document
Found on https://www.crosswordclues.com/clue/bref

---

BREF

BAT Reference Document.
Found on https://www.encyclo.co.uk/local/20720

---

BREF

Stands for best reference and refers to best available technique documentation which is often used as a benchmark environmental performance measure
Found on https://www.steelonthenet.com/files/glossary-5.html

---