The following shell bone script
Its small seal script is
is "Door", and
A Ear in Door is to Hear.
It is no similarity to the shell bone script except the Ear.
In the ancient time, there were less characters than that people needed in communication. For example, there was the character for "Hear", but no character for "Smell". So ancient Chinese used this character for "Smell" too. Gradually, it means "Smell" more than "Hear", or people use it as "Smell" much more often than for "Hear", especially in oral Chinese. But it still has the meaning of hearing in written words.
The character 嗅 discussed in Post 189 is another character for "Smell" (see Post 189 for more detail information).
The clerical script for this character is
The current standard printing script (song script) for traditional character is
very similar to the clerical script.
The song script for simplified script is
Its Pinyin is Wen1.