The Industrial Design consists of the features of shape, pattern, ornament and configuration of the biscuit shown in the drawings. Figures 1 to 7 show a first variant. Figures 8 to 14 show a second variant. Figures 15 to 21 show a third variant. Figures 22 to 28 show a fourth variant. The portion shown in stippled lines are for illustrative purposes only and do not form part of the design. Drawing(s)/photograph(s) of the design is (are) included. Fig. 1 is a top side perspective view of a first variant of the biscuit illustrating the present design; Fig. 2 is a top view of the biscuit as shown in Fig. 1; Fig. 3 is a bottom view of the biscuit as shown in Fig.1; Fig. 4 is a left side view of the biscuit as shown in Fig. 1; Fig. 5 is a right side view of the biscuit as shown in Fig. 1; Fig. 6 is a top first end perspective view of the biscuit as shown in Fig. 1; Fig. 7 is a top second end perspective view of the biscuit as shown in Fig. 1; Fig. 8 is a top side perspective view of a second variant of the biscuit illustrating the present design; Fig. 9 is a top view of the biscuit as shown in Fig. 8; Fig. 10 is a bottom view of the biscuit as shown in Fig. 8; Fig. 11 is a left side view of the biscuit as shown in Fig. 8; Fig. 12 is a right side view of the biscuit as shown in Fig. 8; Fig. 13 is a top first end perspective view of the biscuit as shown in Fig. 8; Fig. 14 is a top second end perspective view of the biscuit as shown in Fig. 8; Fig. 15 is a top side perspective view of a third variant of the biscuit illustrating the present design; Fig. 16 is a top view of the biscuit as shown in Fig. 15; Fig. 17 is a bottom view of the biscuit as shown in Fig. 15; Fig. 18 is a left side view of the biscuit as shown in Fig. 15; Fig. 19 is a right side view of the biscuit as shown in Fig. 15; Fig. 20 is a top first end perspective view of the biscuit as shown in Fig. 15; Fig. 21 is a top second end perspective view of the biscuit as shown in Fig. 15; Fig. 22 is a top side perspective view of a fourth variant of the biscuit illustrating the present design; Fig. 23 is a top view of the biscuit as shown in Fig. 22; Fig. 24 is a bottom view of the biscuit as shown in Fig. 22; Fig. 25 is a left side view of the biscuit as shown in Fig. 22; Fig. 26 is a right side view of the biscuit as shown in Fig. 22; Fig. 27 is a top first end perspective view of the biscuit as shown in Fig. 22; and Fig. 28 is a top second end perspective view of the biscuit as shown in Fig. 22.