fk = forward knot. bk = backward knot
FK/BK are references to names of knots. So FK is forward knot, and BK is backwards knot. So with a FK, you take your 2 strands and make a "number four" shape, and you finish wrapping around and pulling through. A BK is similar, but you make a backwards "number four" and then finish wrapping around and pulling through. When you see them with slashes, it means to do it one way and then the other way.
Fuller-KinyonTM Pumps
fk u fk u fk u
fk u and fk u and fk uuu
FK Ferizaj was created in 1923.
The tenant of Stadion FK Partizan is FK Partizan in Serbia.
FK Smederevo was created in 1924.
FK Pelikán Děčín was created in 1921.
FK Lokomotiva Beograd was created in 1985.
Gällstads FK was created in 2001.
FK Srem was created in 1919.
FK ASK was created in 1923.