"Mu" is a Japanese word that means "nothing". (https://selftaughtjapanese.com/2019/01/15/mu-%E7%84%A1-the-japanese-word) 無 pic is the word, mu, in kanji as a light blue emoji with a dark blue background. Google-based. (https://github.com/googlei18n/noto-emoji/blob/f2a4f72/svg/emoji_u1f21a.svg, Apache License 2.0 https://www.apache.org/licenses/LICENSE-2.0) Banner is a daikon radish patch beside flowering oregano with some grass, illustrating no-till, no pesticide & no "weeding".