Short for STYLOGRAPH (pen).
1890. Stationery & Bookselling, 30 April, 111/2. The arrangements of the ‘British Stylo’ are such as to secure an immunity from that ‘getting out of order’ so common to the stylo when first introduced.
1902. Daily Chron., 29 July, 3/1. All that is needed is a writing-pad and a stylo pen.
