[Admins]

The #i message code is for signs only, there are two versions:
#i(filename) - displays an image
#i(filename,x,y,width,height) - displays part of an image (like setimgpart)

On clientside you can use say2, but it is recommended to use say and say2 on serverside only. It means less data that needs to be sent to the client, you can use all serverside variables, you can use the translation system (currently on Kingdoms, but sometime soon also on Era), and the 'lag' between touching the npc and receiving the sign text is really low, especially in new scripting engine.
I don't see any problem with the say command, just use it on serverside.