∴

∴ is sometimes also written

:.

or

.'.

&c. in cases where only plain ASCII was available.

“These three dots, hereinafter written “∴” are a form of ellipsis from Freemasonry. Technically, they refer to someone or some organisation that has the secrets of a Master Mason. Hence, a 3rd Degree Mason might style himself “Bro∴ John Smith”, whilst the Ancient and Accepted Scottish Rite might be abbreviated “A∴ and A∴ S∴R∴.” A number of hermetic (see Hermeticism) organisations have, quite presumptuously in some cases, adopted the use of ∴ even though they cannot in any sense really be Masonic.”—Glossary of Commonly Used Terms in the Western Mystery Tradition

• ∴ (N.B. This search doesn't actually work properly.)

• Glossary of Commonly Used Terms in the Western Mystery Tradition
• A∴A∴

• https://en.wikipedia.org/wiki/Three_dots