(Internet slang, often humorous) Used to abbreviate words or sentences when the rest is implicitly known.

Visual rendering of Morse code for ナ.

Visual rendering of Morse code for タ.

The hiragana syllable ど (do) or the katakana syllable ド (do) in Japanese braille.

The hiragana syllable ろ (ro) or the katakana syllable ロ (ro) in Japanese braille.

Visual rendering of Morse code for ヘ.

Visual rendering of Morse code for リ.

Visual rendering of Morse code for キ.

The hiragana syllable ね (ne) or the katakana syllable ネ (ne) in Japanese braille.

The hiragana syllable ぶ (bu) or the katakana syllable ブ (bu) in Japanese braille.