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2. 2.5-millimeter band - Wikipedia

   en.wikipedia.org/wiki/2.5-millimeter_band

   The 2.5-millimeter or 122 GHz band is a portion of the EHF radio spectrum internationally allocated to amateur radio use between 122.250 GHz and 123.000 GHz. [1]The band is close to a molecular resonance of oxygen at 120 GHz, which causes significant atmospheric propagation losses, similar to that found at 60 GHz.

3. List of military headstamps - Wikipedia

   en.wikipedia.org/wiki/List_of_military_headstamps

   The symbols on the lower arc of the stamp indicates the caliber (7.7mm, 5.56mm or 7.62mm) and R# or R#M# indicate the model (R) and mark (M) of the cartridge, like the Commonwealth L#A# stamp (e.g., R1M1 is the first model and second Mark of a cartridge). Later, the 2-digit year is in the 12 o'clock position and a digit in the 6 o'clock ...

4. Phone connector (audio) - Wikipedia

   en.wikipedia.org/wiki/Phone_connector_(audio)

   The 2.5 mm or sub-miniature sizes were similarly popularized on small portable electronics. They often appeared next to a 3.5 mm microphone jack for a remote control on-off switch on early portable tape recorders; the microphone provided with such machines had the on-off switch and used a two-pronged connector with both the 3.5 and 2.5 mm plugs.

5. Postage stamps and postal history of New South Wales

   en.wikipedia.org/wiki/Postage_stamps_and_postal...

   1899 reissue in dark blue of 1897 2½d Diamond Jubilee stamp. In 1897 two early semi-postal stamps were issued, paying 1d and 2½d rates, but sold for 1/- and 2/6 respectively, the additional proceeds going to a Consumptives' Home. In the same year a set of three stamps marked Victoria's Diamond Jubilee.

6. Sun Yat-sen stamps - Wikipedia

   en.wikipedia.org/wiki/Sun_Yat-sen_stamps

   On 1944-12-25 a set of five stamps was released for the 50th Anniversary of the founding in Hawaii on 1894-11-11 of Xingzhonghui (興中會), or Revive China Society, predecessor of the Kuomintang (Chinese Nationalist Party). The stamp was lithographed with rubber plates by the Central Trust Bureau in Chongqing, and issued without gum.

7. Titanium alloys - Wikipedia

   en.wikipedia.org/wiki/Titanium_alloys

   Titanium alone is a strong, light metal. It is stronger than common, low-carbon steels, but 45% lighter. It is also twice as strong as weak aluminium alloys but only 60% heavier. Titanium has outstanding corrosion resistance to seawater, and thus is used in propeller shafts, rigging and other parts of boats that are exposed to seawater.