What is this symbol with the four dots?

4yr ⋅ ⋅

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My Dad really put in the effort for this gift card.

9yr ⋅

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150 years ago yesterday. Surrender at Appomattox Courthouse (April 9, 1865)[4211x3218]

9yr ⋅

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Bypass humidifier duct to bottom of supply duct?

1mo ⋅

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Me for the past three days after work.

11yr ⋅

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The dog knows something I don't know.

10yr ⋅

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Late Christmas present from the wife, original 1919 newspapers.

10yr ⋅

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50th Pa Inf, Gettysburg, Pa., July, 1865 [1468x1200]

11yr ⋅

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New to me 2nd gen

9yr ⋅

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My Grandfather's B-29 smashed up on Guam, 1945 [771 x 421]

13yr ⋅

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