John Montgomery discusses the glyphs pakal and pa-ka-la both referring to a type of shield among the Maya.
John Montgomery, Dictionary of Maya Hieroglyphics (New York: Hippocrene Books, Inc., 2002), 200
PAKAL (pakal) (T624v) 1 n. “shield” 2 n. the name of several Palenque Classic Period kings, including Pakal the Great (ruled A.D. 615-683) Represents a specific type of shield
pa-ka-la (pakal) T586.25:178) 1 n. “shield” 2 n. the name of several Palenque Classic Period kings, including Pakal the Great (ruled A.D. 615-683)