L.2.9 Bitmap fonts
26.2343GPPProtocols and codecsRelease 17Transparent end-to-end Packet-switched Streaming Service (PSS)TS
When using bitmapped fonts to display text, the content author needs to be aware of the limitations. Rotated text using a bitmapped font may be unreadable.
Recommendation: When using bitmapped fonts, content creators should avoid the display of text rotated at an arbitrary angle. Instead, only multiples of 90 degrees should be used to ensure readability.