In addition to what's been said (I don't know what context you are coming from), it might be for some extra chars that are not part of ASCII. See for example <http://en.wikipedia.org/wiki/CP437>, where they are (were) used for ←, ∟, and ↔. On character-based displays, it was handy to have special chars for box drawing borders and such.
> -----Original Message----- > From: unicode-bou...@unicode.org [mailto:unicode-bou...@unicode.org] On > Behalf Of aby...@yandex.ru > Sent: Wednesday, July 07, 2010 9:08 AM > To: unicode@unicode.org > Subject: 001B, 001D, 001C > > Hello! > > 001B, 001D, 001C are present in some keyboard layouts. What are these > characters used for? TradeStation Group, Inc. is a publicly-traded holding company (NASDAQ GS: TRAD) of three operating subsidiaries, TradeStation Securities, Inc. (Member NYSE, FINRA, SIPC and NFA), TradeStation Technologies, Inc., a trading software and subscription company, and TradeStation Europe Limited, a United Kingdom, FSA-authorized introducing brokerage firm. None of these companies provides trading or investment advice, recommendations or endorsements of any kind. The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from any computer.
