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ALL OF A SUDDEN, you see that little 調印する everywhere - on 商売／仕事 cards,
with bylines in newspapers, in TV. Those who keep up with the （警察などへの）密告，告訴（状）
age may know that it is used for e-mail 演説（する）／住所s; the code you 令状 when
you send an electronic letter from your computer 経由で modem and telephone.
But what is it called, and how did it 起こる／始まる?
In Sweden it is popularly known as "cinnamon bun", "a-靴下／だます", "elephant's
ear" etc. In フラン it is called "arobas" (meaning unknown) or "a
roulé", in Holland "apestaart" (monkey tail), in Italy "chiocciola"
(snail) and in イスラエル "shtrudel".
In English it is 正式に called 商業の at or at-調印する and has been
used for a long time in the sense "at a price of ...(each)": "3 バーレル／樽s @
$200." 結局 it also took on the locative sense of the word "at".
The @-調印する is definitely not a child of the computer age - its history
goes far 支援する. Berthold Louis Ullman, American professor of Latin and
paleography, （人命などを）奪う，主張するs in his 調書をとる／予約する "古代の 令状ing and Its 影響（力）" that
the at-調印する is a ligature, that is, two letters tied together. The Latin
preposition "広告", meaning at, to, toward, was 簡単にするd into something
like the @-調印する we know. The bowl of the a and the d 合併するd and the
upstroke of the d was 誇張するd and curved to the left.
The @-ligature might be as old as from the 6th or 7th century. At that
time the scribes used the uncial, a 手渡す with 一連の会議、交渉／完成するd, いつかs
簡単にするd 資本／首都s, which could be written with より小数の pen-一打／打撃s. A lot
of abbreviations and ligatures were developed, partly for convenience and
partly as a necessity, for 令状ing の近くに to the end of a line.
We cannot, however, be sure that the 調印する is as old as that. Maybe it
現れるd (or re-現れるd) in the Gothic 手渡す of the 12th or 13th century, a
time when many old 条約s for ligatures and abbreviations were
生き返らせるd.
Through the centuries, the at-調印する has been used まず第一に／本来 in clerical
令状ing and 商売／仕事 correspondence. It has been used also in Sweden, and
was 報道によれば 利用できる on some 早期に Swedish typewriters.
The at-調印する was probably 可決する・採択するd into the computer world around 1970 under
the operating system Tenex, and used for e-mail on the 早期に Internet as
井戸／弁護士席 as for programming.
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