What is the meaning of ъ?

A letter of the Cyrillic script, called hard sign.

A letter of the Old Cyrillic script, called back yer or yeru.

The sixty-sixth letter of the Abaza alphabet, written in the Cyrillic script.

The fifty-ninth letter of the Adyghe alphabet, written in the Cyrillic script.

The forty-seventh letter of the Aghul alphabet, written in the Cyrillic script.

The thirty-fourth letter of the Alutor alphabet, written in the Cyrillic script.

The thirty-first letter of the Buryat alphabet, written in the Cyrillic script.

The thirty-first letter of the Chukchi alphabet, written in the Cyrillic script.

The forty-first letter of the Dargwa alphabet, written in the Cyrillic script.

The thirty-third letter of the Dungan alphabet, written in the Cyrillic script.

The thirty-first letter of the Eastern Mari alphabet, written in the Cyrillic script.

The thirty-first letter of the Even alphabet, written in the Cyrillic script.

The twenty-ninth letter of the Evenki alphabet, written in the Cyrillic script.

The thirty-ninth letter of the Ingush alphabet, written in the Cyrillic script.

The forty-second letter of the Itelmen alphabet, written in the Cyrillic script.

The fifty-third letter of the Kabardian alphabet, written in the Cyrillic script.

The thirty-fourth letter of the Khakas alphabet, written in the Cyrillic script.

The thirty-fourth letter of the Kumyk alphabet, written in the Cyrillic script.

The thirty-first letter of the Kyrgyz alphabet, called ажыратуу белгиси (ajıratuu belgisi), and written in the Cyrillic script.

The fortieth letter of the Lezgi alphabet, written in the Cyrillic script.

The forty-first letter of the Nivkh alphabet, written in the Cyrillic script.

The thirty-fifth letter of the Northern Mansi alphabet, written in the Cyrillic script.

A letter of the Old Novgorodian alphabet, written in the Old Cyrillic script.

The thirty-second letter of the Southern Altai alphabet, written in the Cyrillic script.

The forty-first letter of the Tabasaran alphabet, written in the Cyrillic script.

The twenty-ninth letter of the Tundra Nenets alphabet, written in the Cyrillic script.

The thirty-first letter of the Western Mari alphabet, written in the Cyrillic script.

The thirty-fifth letter of the Yakut alphabet, called кытаанах бэлиэ (kıtaanaq belie), and written in the Cyrillic script.

The forty-first letter of the Avar alphabet, written in the Cyrillic script.

The thirty-sixth letter of the Bashkir alphabet, written in the Cyrillic script.

The twenty-seventh letter of the Bulgarian alphabet, called ер голям (er goljam), and written in the Cyrillic script.

The forty-first letter of the Chechen alphabet, written in the Cyrillic script.

The thirty-second letter of the Chuvash alphabet, written in the Cyrillic script.

The thirty-second letter of the Crimean Tatar alphabet, written in the Cyrillic script.

The thirty-fourth letter of the Kalmyk alphabet, written in the Cyrillic script.

The thirty-sixth letter of the Kazakh alphabet, written in the Cyrillic script.

The thirtieth letter of the Mongolian alphabet, called хатуугийн тэмдэг (xatuugiin temdeg), and written in the Cyrillic script.

The thirty-eighth letter of the Ossetian alphabet, written in the Cyrillic script.

The twenty-eighth letter of the Russian alphabet, called твёрдый знак (tvjórdyj znak), and written in the Cyrillic script.

The thirty-second letter of the Tajik alphabet, written in the Cyrillic script.

The thirty-fourth letter of the Tatar alphabet, written in the Cyrillic script.

The thirty-first letter of the Tuvan alphabet, written in the Cyrillic script.

The thirty-third letter of the Udmurt alphabet, written in the Cyrillic script.

The twenty-seventh letter of the Uzbek alphabet, written in the Cyrillic script.

Source: wiktionary.org