It is a modification of titlo adapted for covering (hence its name, Russian for 'covering') combining Cyrillic letters (so called letter-titlos). It is conventionally not used with combining modifications of letters Д, Ж, З and Х, although exceptions happen, especially in skoropis′.
The character was introduced into Unicode 5.1 in April 2008.
Everson, Michael; Birnbaum, David; Cleminson, Ralph; Derzhanski, Ivan; Dorosh, Vladislav; Kryukov, Alexej; Paliga, Sorin; Ruppel, Klaas (2007-03-21), Proposal to encode additional Cyrillic characters in the BMP of the UCS (PDF), ISO/IEC JTC1/SC2/WG2 N3194R L2/07-003R
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