During the 1890s, flirtation codes were very popular. These included glove flirtation, handkerchief flirtation, parasol flirtation, fan flirtation, hat flirtation, and eye flirtation. There was even a method of communicating your feelings to the recipient a letter or postcard by the orientation of the postage stamp. Below is an example of a small reference card that could have been utilized to assist with this courting etiquette. I will have to examine images from the 1890s with a new perspective.
If this intrigues you, please reference these other websites:
Cipher Mysteries - Flirtation Codes
Glove Flirtation
c. 1890s