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Here is some various information that comes in handy while working:

DIN Paper sizes. A, normal paper (A fits in C, C fits in B):

DIN Size:in mm. in inches.
A0841 x 1189 mm. 33.1 x 46.8 in.
A1594 x 841 mm. 23.4 x 33.1 in.
A2420 x 594 mm. 16.5 x 23.4 in.
A3297 x 420 mm. 11.7 x 16.5 in.
A4210 x 297 mm. 8.3 x 11.7 in.
A5148 x 210 mm. 5.8 x 8.3 in.
A6105 x 148 mm. 4.1 x 5.8 in.
A774 x 105 mm. 2.9 x 4.1 in.
A852 x 74 mm. 2 x 2.9 in.
A937 x 52 mm. 1.5 x 2 in.
A1026 x 37 mm. 1 x 1.5 in.
A1118 x 26 mm. 0.7 x 1 in.
A1213 x 18 mm. 0.5 x 0.7 in.
A139 x 13 mm. 0.4 x 0.5 in.
2A01189 x 1682 mm. 46.8 x 66.2 in.
4A01682 x 2378 mm. 66.2 x 93.6 in.
A0+914 x 1292 mm. 36 x 50.9 in.
A1+609 x 914 mm. 24 x 36 in.
A3+329 x 483 mm. 12.9 x 19 in.
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DIN Paper sizes. B, mostly used for books, posters, envelopes (A fits in C, C fits in B):

DIN Size:in mm. in inches.
B01000 x 1414 mm. 39.4 x 55.7 in.
B1707 x 1000 mm. 27.8 x 39.4 in.
B2500 x 707 mm. 19.7 x 27.8 in.
B3353 x 500 mm. 13.9 x 19.7 in.
B4250 x 353 mm. 9.8 x 13.9 in.
B5176 x 250 mm. 6.9 x 9.8 in.
B6125 x 176 mm. 4.9 x 6.9 in.
B788 x 125 mm. 3.5 x 4.9 in.
B862 x 88 mm. 2.4 x 3.5 in.
B944 x 62 mm. 1.7 x 2.4 in.
B1031 x 44 mm. 1.2 x 1.7 in.
B1122 x 31 mm. 0.9 x 1.2 in.
B1215 x 22 mm. 0.6 x 0.9 in.
B1311 x 15 mm. 0.4 x 0.6 in.
B0+1118 x 1580 mm. 44 x 62.2 in.
B1+720 x 1020 mm. 28.3 x 40.1 in.
B2+520 x 720 mm. 20.5 x 28.3 in.
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DIN Paper sizes. C, mostly used for envelopes (A fits in C, C fits in B):

DIN Size:in mm. in inches.
C0917 x 1297 mm. 36.1 x 51 in.
C1648 x 917 mm. 25.5 x 36.1 in.
C2458 x 648 mm. 18 x 25.5 in.
C3324 x 458 mm. 12.8 x 18 in.
C4229 x 324 mm. 9 x 12.8 in.
C5162 x 229 mm. 6.4 x 9 in.
C6114 x 162 mm. 4.5 x 6.4 in.
C781 x 114 mm. 3.2 x 4.5 in.
C857 x 81 mm. 2.2 x 3.2 in.
C940 x 57 mm. 1.6 x 2.2 in.
C1028 x 40 mm. 1.1 x 1.6 in.
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Sizes from euro banknotes:

Banknotes:in mm.
5 €120 x 62 mm.
10 €127 x 67 mm.
20 €133 x 72 mm.
50 €140 x 77 mm.
100 € (1)147 x 82 mm.
100 € (2)147 x 77 mm.
200 € (1)153 x 82 mm.
200 € (2)153 x 77 mm.
500 €160 x 82 mm.
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Various sizes:

Various sizes:in mm.
Credit card:85 x 55 mm.
Post card:105 x 148 mm.
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Solveggio tones:

Frequency:
174 Hz
285 Hz
396 Hz
417 Hz
432 Hz
528 Hz
639 Hz
741 Hz
852 Hz
963 Hz
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