◌̿

A double horizontal line to be placed above letters and digits. It connects to itself on either side if it's also placed over those letters.

◌̿

1. (Roman numerals) Multiplies the value of a group of digits by one million.

   IV — four; I̅V̅ — four thousand; I̿V̿ — four million

2. (Greek numerals) In Byzantine Greek and in Coptic, multiplies the value of a digit by a thousand. E.g. β̿ (modern ͵β) '2,000'.

• Roman numerals#Vinculum on Wikipedia.Wikipedia