We claim the ornamental design for a robotic arm segment, as shown and described.
FIG. 1 is a right-hand view of a robotic arm segment in a first position.
FIG. 2 is a left-hand view of the robotic arm segment in the first position.
FIG. 3 is an upper-right-rear isometric view of the robotic arm segment in the first position.
FIG. 4 is an expanded right-hand view of the robotic arm segment in the first position.
FIG. 5 is a left-hand view of the robotic arm segment in a second position.
FIG. 6 is a right-hand view of the robotic arm segment in the second position.
FIG. 7 is a rear view of the robotic arm segment in the second position.
FIG. 8 is a front view of the robotic arm segment in the second position; and,
FIG. 9 is an upper-left-front isometric view of the robotic arm segment in the second position.
Broken lines in a dash-dash-dash pattern shown in the FIGURES depict environmental structure. Broken lines in a dash-dot-dash pattern shown in the FIGURES depict boundary lines and additional features of the robotic arm segment. Broken lines in a dot-dot-dot pattern shown in the FIGURES depict iconographic features of the robotic arm segment. However, no broken line shown in the FIGURES forms any part of the design claimed in the instant Application.