The most frequent autonomic symptoms associated with multiple system atrophy are a sudden drop in blood pressure upon standing (orthostatic hypotension), urinary difficulties, and erectile dysfunction in men.
The IBM Selectric typewriter was a highly successful model line of electric typewriters introduced by IBM on 31 July 1961.
Once a rarely used key on the typewriter, the graceful character has become the very symbol of modern electronic communication. Although the first documented use of @ was in 1536, the symbol did not rise from modern obscurity until 1971.