I have seen two common abbreviations written on tefillin cases (I'm referring to the, most commonly red, cases that you put the tefillin into when you have completed wearing them):
תובב"א and פעיה"ק
What do these abbreviations mean?
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Wikimilon has the abbreviation
תיבּנה ותיכּונן במהרה בימינו אמן.
It should be built and established speedily in our days, amen.
The abbreviation is used for the 4 holy cities ירושלים, טבריה, צפת וחברון; Jerusalem, Tiberias, Safed and Hebron.
And is used as in this example
בעיה"ק ירושלים תובב"א