Higbee Indicator 1 : A mark on the out-side of a coupling that points to the Higbee cut; it can be matched with the Higbee indicator on the other coupling to prevent cross-threading during connection
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}