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2. Flicker vertigo - Wikipedia

   en.wikipedia.org/wiki/Flicker_vertigo

   Flicker vertigo, sometimes called the Bucha effect, is "an imbalance in brain-cell activity caused by exposure to low-frequency flickering (or flashing) of a relatively bright light." [ 1 ] It is a disorientation -, vertigo -, and nausea -inducing effect of a strobe light flashing at 1 Hz to 20 Hz, approximately the frequency of human brainwaves .

3. Navigation light - Wikipedia

   en.wikipedia.org/wiki/Navigation_light

   Watercraft navigation lights must permit other vessels to determine the type and relative angle of a vessel, and thus decide if there is a danger of collision. In general, sailing vessels are required to carry a green light that shines from dead ahead to 2 points (22 + 1 ⁄ 2 °) abaft [note 1] the beam on the starboard side (the right side from the perspective of someone on board facing ...

4. List of Royal Artillery batteries - Wikipedia

   en.wikipedia.org/wiki/List_of_Royal_Artillery...

   Headquarters (King's) Battery, 103rd (Lancashire Artillery Volunteers) Regiment Royal Artillery – formed as HQ Battery, subtitle '(King's)' added in 1969 from Liverpool Rifles, reduced to HQ Troop under Future Army Structure in 2004, disbanded and subsequently reformed in 2014 under Army 2020, but lineage transferred to South Lancashire Artillery