For example, in the time before the 1900s, bold fonts were never used as display fonts. However, bold fonts were well-known developed as display fonts. I.e. high contrast fonts for advertisements and display. Improve your English listening with Sajan Ko Pereira. Buy his E-Learning library. Calligraphy with bold features represents speech/writing on a much bigger, unique, and special tone/ message. Bold Typefaces are unique and show their authority over their challenger.