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Now take a look at Figure 6.2, which illustrates the seasonal movement of the ITCZ in Africa. Notice that the maps include two acronyms: Congo Air Boundary (CAB) and surface (sfc).
Figure 6.2 Seasonal variability of the Intertropical Convergence Zone (ITCZ), Congo air boundary (CAB), tropical rain belt, and surface winds over Africa (Amin Dezfuli, 2017. CC BY-SA 4.0).
Source: Amin Dezfuli, https://commons.wikimedia.org/wiki/File:ITCZ_Africa.png This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 License.